Southern Ontario Highway Closures and Snow Storm: Trend Summary
Heavy snowfall and strong winds caused multiple collisions and significant highway closures across southern Ontario and the GTHA on Friday, March 13, 2026. Emergency crews responded to several high-impact accidents, including a major transport truck crash that resulted in injuries. The inclement weather severely disrupted the evening commute and forced the closure of key arterial routes including parts of Highway 401.
TL;DR
- Highway 401 and several regional roads closed due to heavy snow and multiple collisions.
- At least two people were injured in a serious transport truck crash.
- Strong winds and rapid snow accumulation caused 'whiteout' conditions for commuters.
- Major travel delays persist across the Waterloo Region, Guelph, and the GTHA.
What Happened
A sudden winter storm swept through southern Ontario on Friday, bringing a mixture of heavy snow and powerful wind gusts. By the afternoon, the Ontario Provincial Police (OPP) reported a surge in traffic accidents as visibility dropped to near zero in several areas. The most significant disruption occurred on Highway 401, where a series of collisions led to total closures in sections between Cambridge, Ayr, and Woodstock. In one specific incident, a transport truck was involved in a major crash that left two people with injuries, requiring emergency medical intervention and a prolonged investigation by authorities. Local police departments in Kitchener, Waterloo, and Guelph reported dozens of minor fender-benders and vehicles sliding off the road as the accumulation reached several centimeters within a few hours.
Key Developments
The Ministry of Transportation confirmed that maintenance crews were deployed at full capacity, but the rate of snowfall made it difficult to keep lanes clear. Highway 401 was particularly affected, with westbound lanes closed at Highway 40 and various on-ramps blocked to prevent further congestion. Public transit services in the GTHA reported delays of up to 30 minutes on several bus and rail lines due to the slick conditions. Authorities have urged residents to avoid non-essential travel while the cleanup continues. For real-time updates on provincial road statuses, travelers can check the Official Ontario 511 traveler information portal.
Why This Matters
These closures impact the primary commercial artery of Canada, slowing down the movement of goods between Windsor and Toronto. The timing of the storm during the Friday evening rush hour maximized the number of stranded motorists and increased the risk of secondary collisions. Furthermore, the severity of the transport truck incident highlights the persistent dangers of heavy vehicle operation during winter squalls, potentially leading to renewed calls for stricter safety protocols or mandatory speed reductions during weather alerts.
What Happens Next
Environment Canada predicts that the snow will taper off by early Saturday morning, but strong winds will continue to cause blowing snow and reduced visibility. Cleanup operations are expected to continue throughout the night, with the goal of reopening all Highway 401 lanes before the Saturday morning traffic peak. Motorists should check for updated weather warnings before heading out, as temperatures are expected to drop, leading to potential black ice on untreated surfaces.
Frequently Asked Questions
Which parts of Highway 401 are currently closed?
Major closures were reported in the westbound lanes between Cambridge and Woodstock on Friday afternoon. Some regional on-ramps and sections near Highway 40 also faced temporary blockages due to accidents.
How many people were injured in the transport truck crash?
Official reports from emergency services indicate that two individuals were injured in the transport truck collision. They were transported to a nearby hospital for treatment.
Is public transit affected by the snow storm?
Yes, transit agencies across the GTHA and Waterloo Region reported significant delays on March 13. Some routes experienced service interruptions of over 30 minutes due to road conditions.
When will the road conditions improve?
Conditions are expected to stabilize by Saturday morning as the snow stops. However, salt and plow crews will remain active overnight to address ice accumulation and blowing snow.